ajax和php更新mysql

Question

i am having problem updating the database.

Basically what i am trying to do is everytime a download link is clicked the download count in the database goes up.

Can someone point me in the right direction as i have been trying to get this right for hours :(

Here is the html.

<div class="button_border_dark"> <a id="linkcounter" href="http://www.derby-web-design-agency.co.uk/freeby-download/<?php echo $freebies_download ; ?>" target="_blank" title="Download">Click To Download File</a></div>

Here is the jquery

<script>
$('#linkcounter').bind('click',function(){
    $.post("downloadcount.php",{ linkid: <?php echo $id ; ?>});
});
</script>

Here is the downloadcount.php which i am trying to post data too, so it updates the content.

<?php
require_once("applications/constants/connection.php");
require_once("applications/controllers/basic.php");
if(isset($_REQUEST["linkid"])){

$linkid = sanitise($_POST["linkid"]);

$updatedownload = mysql_query("UPDATE freebies SET download_count=`download_count` +1 WHERE id ='".$linkid."'") OR die(mysql_error());

}

Answer 1

You don't say what is the problem!

Is not incrementing? is incrementing too much? is one process blocking the other? the problem is that people can cheat and make so a file has ben downloaded a million times?

Anyway, I think you code can be simpler.

$('#linkcounter').click(function(){
    $("#invisibleiframe").attr("src",$(this).attr("src");
    $.post("downloadcount.php",{ linkid: <?php echo $id ; ?>});
    return false;
});

this need to create a invisible iframe, that will be the one downloaded the file. after starting this download, the ajax request is made. a single event do the two things. made this way the stuff still works if js is disabled.

Answer 2

I think should be

$updatedownload = mysql_query("UPDATE freebies SET download_count= download_count +1 WHERE id ='".$linkid."'") OR die(mysql_error());

Note the single quote:

SET download_count = download_count +1

Answer 3

Well first off I would not mix the jQuery and PHP personally, this may be the source of your problem, I would try something like this

<div class="button_border_dark" theLinkId="<?php echo $id ; ?>">
    <a id="linkcounter" href="http://yourURL/" target="_blank" title="Download">
      Click To Download File
    </a>
</div>

With the jQuery like this

<script>
$('#linkcounter').bind('click',function(){
    var theLinkId = $(this).parent().attr('theLinkId');
    $.post("downloadcount.php",{ linkid : theLinkId});
});
</script>

Answer 4

It is possible that your event is not actually being bound to the anchor, because you are running .bind() before the anchor exists. Try this:

<script>
$(document).ready(function(){
    $('#linkcounter').bind('click',function(){
        $.post("downloadcount.php",{ linkid: <?php echo $id ; ?>});
    });
})
</script>

Answer 5

how many anchors you have with id = 'linkcounter' ?

If you have more than one, i recommend you to change 'id' for 'class'

Greatings.

EDIT:

Try something like this:

<a href="http://www.google.cl" onclick="goToLink(this, 1);">Link</a>

<script type="text/javascript">
function goToLink(o, id) {
    $.post("downloadcounter.php",
           {linkid : id},
           function () {
               window.open($(this).attr("href"));
           }
    );

    return false;
}
</script>